我国新一代极轨气象卫星红外分光计真空辐射定标试验  

Vacuum Radiometic Calibration of IRAS Boarded on New Generation Meteorological Satellite

作　　者：漆成莉[1] 殷德奎[2] 王模昌[2] 董超华[1] 张鹏[1] 马刚[1] 

机构地区：[1]中国气象局中国遥感卫星辐射测量和定标重点开放实验室国家卫星气象中心,北京100081 [2]中国科学院上海技术物理研究所,上海200083

出　　处：《气象科技》2009年第5期572-575,共4页Meteorological Science and Technology

基　　金："极轨气象卫星低光谱红外探测仪器性能指标评价规范"项目资助

摘　　要：为了测试红外分光计红外通道的辐射探测性能,确定仪器地面参考定标系数,为分析反演产品误差提供依据,星载仪器的地面定标是仪器上星前必须要做的一项重要工作。基于我国新一代气象卫星红外分光计热真空定标试验数据,利用仪器通道接收的入射辐射与其输出信号值的相关特性,采用统计回归方法,建立了二者之间的转换关系,得到了热红外通道的定标系数,分析了红外分光计红外通道输入辐射量与输出信号的非线性响应。当目标黑体温度为290 K时,计算了仪器的灵敏度。结果表明：红外分光计存在一定的非线性响应,在220~330 K的目标温度范围内非线性偏差大都在0.4 K以内,仪器灵敏度达到了设计指标要求。In order to test the radiation sounding performance at the infrared channels of the InfraRed Atmospheric Sounder（IRAS） and obtain the reference calibration coefficients so to offer support to the error analysis of the retrieval products,the ground calibration of satellite onboard instruments is a prerequisite task before launching.Based on the correlation of accepted radiance and output digital counts and the lab vacuum calibration experiment data of IRAS,the relation between radiance and output digital counts is set up by means of the statistical regression method.The lab coefficients at the infrared channels are obtained and the non-linear responses of IRAS output signals to the input radiance are analyzed.The noise equivalent differential radiance at 290 K temperature is computed and compared with specifications.The results reveal that there is non-linear response to a certain extent for IRAS,and the non-linear bias values are less than 0.4 K in the range of 220 to 230 K.The noise equivalent differential radiance meets the functional requirements of the IRAS specifications.

关 键 词：辐射定标 红外分光计 气象卫星 

分 类 号：V474.24[航空宇航科学与技术—飞行器设计] TH744.123[机械工程—光学工程]